package com.loveling.servlet;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

/**
 * Created with IntelliJ IDEA.
 * User: liangjiefa
 * Date: 2017/6/4 0:00
 * To change this template use File | Settings | File Templates.
 */

/**
 *
 * 使用注解标注过滤器
 * @WebFilter将一个实现了javax.servlet.Filter接口的类定义为过滤器
 * 属性filterName声明过滤器的名称,可选
 * 属性urlPatterns指定要过滤的URL模式,也可使用属性value来声明.(指定要过滤的URL模式是必选属性)
 */

// 测试地址：http://127.0.0.1:8080/myFilter
@WebFilter(filterName = "myFilter",urlPatterns = "/myFilter/*")
public class MyFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("=============过滤器初始化=============");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("=============执行过滤操作=============");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {
        System.out.println("=============过滤器销毁=============");
    }
}
